	package capstoneproject.dudiachi.Controller;
	
	import java.io.InputStream;
import java.util.ArrayList;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;

import org.apache.http.HttpResponse;
import org.apache.http.client.HttpClient;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.protocol.BasicHttpContext;
import org.apache.http.protocol.HttpContext;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

import android.util.Log;

import com.google.android.gms.maps.model.LatLng;
	
	public class GMapV2Direction {
		public final static String MODE_DRIVING = "driving";
		public final static String MODE_WALKING = "walking";
		
		public GMapV2Direction() { }
		
		public Document getDocument(LatLng start, LatLng end, String mode) {
			String url = "http://maps.googleapis.com/maps/api/directions/xml?" 
	        		+ "origin=" + start.latitude + "," + start.longitude  
	        		+ "&destination=" + end.latitude + "," + end.longitude 
	        		+ "&sensor=false&units=metric&mode=driving";
			
			Log.d("GoogleMapsDirection", url);
	        try {
	            HttpClient httpClient = new DefaultHttpClient();
	            HttpContext localContext = new BasicHttpContext();
	            HttpPost httpPost = new HttpPost(url);
	            HttpResponse response = httpClient.execute(httpPost, localContext);
	            InputStream in = response.getEntity().getContent();
	            DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
	            Document doc = builder.parse(in);
	            return doc;
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
			return null;
		}
		
		public String getDurationText (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("duration");
	        Node node1 = nl1.item(nl1.getLength() - 1);
	        NodeList nl2 = node1.getChildNodes();
	        Node node2 = nl2.item(getNodeIndex(nl2, "text"));
	        Log.i("DurationText", node2.getTextContent());
			return node2.getTextContent();
		}
		
		public int getDurationValue (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("duration");
	        Node node1 = nl1.item(nl1.getLength() - 1);
	        NodeList nl2 = node1.getChildNodes();
	        Node node2 = nl2.item(getNodeIndex(nl2, "value"));
	        Log.i("DurationValue", node2.getTextContent());
			return Integer.parseInt(node2.getTextContent());
		}
		
		public String getDistanceText (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("distance");
	        Node node1 = nl1.item(nl1.getLength() - 1);
	        NodeList nl2 = node1.getChildNodes();
	        Node node2 = nl2.item(getNodeIndex(nl2, "text"));
	        Log.i("DistanceText", node2.getTextContent());
			return node2.getTextContent();
		}
		
		public int getDistanceValue (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("distance");
	        Node node1 = nl1.item(nl1.getLength() - 1);
	        NodeList nl2 = node1.getChildNodes();
	        Node node2 = nl2.item(getNodeIndex(nl2, "value"));
	        Log.i("DistanceValue", node2.getTextContent());
			return Integer.parseInt(node2.getTextContent());
		}
		
		public String getStartAddress (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("start_address");
	        Node node1 = nl1.item(0);
	        Log.i("StartAddress", node1.getTextContent());
			return node1.getTextContent();
		}
		
		public String getEndAddress (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("end_address");
	        Node node1 = nl1.item(0);
	        Log.i("StartAddress", node1.getTextContent());
			return node1.getTextContent();
		}
		
		public String getCopyRights (Document doc) {
			NodeList nl1 = doc.getElementsByTagName("copyrights");
	        Node node1 = nl1.item(0);
	        Log.i("CopyRights", node1.getTextContent());
			return node1.getTextContent();
		}
		
		public ArrayList<LatLng> getDirection (Document doc) {
			NodeList nl1, nl2, nl3;
	        ArrayList<LatLng> listGeopoints = new ArrayList<LatLng>();
	        nl1 = doc.getElementsByTagName("step");
	        if (nl1.getLength() > 0) {
	            for (int i = 0; i < nl1.getLength(); i++) {
	                Node node1 = nl1.item(i);
	                nl2 = node1.getChildNodes();
	
	                Node locationNode = nl2.item(getNodeIndex(nl2, "start_location"));
	                nl3 = locationNode.getChildNodes();
	                Node latNode = nl3.item(getNodeIndex(nl3, "lat"));
	                double lat = Double.parseDouble(latNode.getTextContent());
	                Node lngNode = nl3.item(getNodeIndex(nl3, "lng"));
	                double lng = Double.parseDouble(lngNode.getTextContent());
	                listGeopoints.add(new LatLng(lat, lng));
	
	                locationNode = nl2.item(getNodeIndex(nl2, "polyline"));
	                nl3 = locationNode.getChildNodes();
	                latNode = nl3.item(getNodeIndex(nl3, "points"));
	                ArrayList<LatLng> arr = decodePoly(latNode.getTextContent());
	                for(int j = 0 ; j < arr.size() ; j++) {
	                	listGeopoints.add(new LatLng(arr.get(j).latitude, arr.get(j).longitude));
	                }
	
	                locationNode = nl2.item(getNodeIndex(nl2, "end_location"));
	                nl3 = locationNode.getChildNodes();
	                latNode = nl3.item(getNodeIndex(nl3, "lat"));
	                lat = Double.parseDouble(latNode.getTextContent());
	                lngNode = nl3.item(getNodeIndex(nl3, "lng"));
	                lng = Double.parseDouble(lngNode.getTextContent());
	                listGeopoints.add(new LatLng(lat, lng));
	            }
	        }
	        
	        return listGeopoints;
		}
		
		private int getNodeIndex(NodeList nl, String nodename) {
			for(int i = 0 ; i < nl.getLength() ; i++) {
				if(nl.item(i).getNodeName().equals(nodename))
					return i;
			}
			return -1;
		}
		
		private ArrayList<LatLng> decodePoly(String encoded) {
			ArrayList<LatLng> poly = new ArrayList<LatLng>();
			int index = 0, len = encoded.length();
			int lat = 0, lng = 0;
			while (index < len) {
				int b, shift = 0, result = 0;
				do {
					b = encoded.charAt(index++) - 63;
					result |= (b & 0x1f) << shift;
					shift += 5;
				} while (b >= 0x20);
				int dlat = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
				lat += dlat;
				shift = 0;
				result = 0;
				do {
					b = encoded.charAt(index++) - 63;
					result |= (b & 0x1f) << shift;
					shift += 5;
				} while (b >= 0x20);
				int dlng = ((result & 1) != 0 ? ~(result >> 1) : (result >> 1));
				lng += dlng;
				
				LatLng position = new LatLng((double) lat / 1E5, (double) lng / 1E5);
				poly.add(position);
			}
			return poly;
		}
	}
